The fourth circulating water system of the China Coal Yulin Coal Deep Processing Base project uses a closed-loop system

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From February 19th to 20th, the 30% model review meeting for the fourth circulating water system of the China National Coal Group Yulin Coal Deep Processing Base project was successfully held at Jiangsu Shuangliang Cooling System Co., Ltd. This review signifies that significant phased progress has been made in the design of this system, laying a solid foundation for subsequent construction efforts. For this review, a review team composed of professionals from various fields such as process engineering and equipment was established. The meeting heard presentations from Hualu Engineering Technology Co., Ltd. and Shuangliang Cooling System Co., Ltd. regarding the layout of the processes for the fourth circulating water system, the piping and instrumentation diagrams (P&ID), and the placement of key equipment. The participants put forward more than 30 various review suggestions, taking into account relevant standards and specifications in the water treatment industry, the operation status of the first-phase production facilities of China Coal, the conditions of production and maintenance, as well as the operational experience of similar facilities. These review suggestions will be carefully considered and implemented in the subsequent design, procurement, and construction phases of the facilities, thereby laying a solid foundation for the safe and stable operation of the production facilities at the China Coal Yulin Coal Deep Processing Base project. The fourth circulating water system of this project is primarily used to provide circulating cooling water for three air separation units with an oxygen production capacity of 85,000 Nm3/h each. It operates in a closed-loop mode, with a maximum water flow rate of 21,500 tons per hour. Compared to conventional open-loop circulating water systems, it offers significant water savings, low wastewater discharge, stable water quality, and a long service life for equipment. Therefore, it is well-suited for widespread use in northern regions where water resources are relatively scarce. The preliminary investment estimate for the China Coal Yulin Coal Deep Processing Base project is 23.888 billion yuan. The main construction activities include 2.2 million tons per year of methanol and 900,000 tons per year of polyolefins; at the same time, the existing first-phase coal chemical plant will be optimized and upgraded, with the construction of a project for the production of 250,000 tons per year of LDPE/EVA through chain extension and enhancement, along with related facilities. The main units of the project include air separation, gasification, purification, sulfur recovery, methanol synthesis, MTO, olefin separation, 3 polyolefin units, and 1 EVA unit, among others. Completion of construction and commissioning are expected by mid-2026. Once the project is put into operation, it will effectively promote local economic and social development as well as the optimization and upgrading of the industrial structure; during peak periods, it can create employment opportunities for tens of thousands of people. By then, China Coal Shaanxi Company will further enhance the new advantages of its role as the leading enterprise in the industrial chain, promote the development of coal chemicals in a direction toward higher quality, greater diversity, and lower carbon emissions, as well as foster integrated development among coal, coal-fired power, and new energy sources, thereby creating a robust industrial and value chain.